Glock 21 Holsters for Gen 3, Gen 4, Gen 5, and SF Variants
IWB Glock 21 Holsters for Concealed Carry
Carrying a full-size .45 ACP like the Glock 21 requires a holster that manages weight and minimizes printing. Alien Gear’s Glock 21 IWB holsters, including the Cloak Tuck 3.5 and ShapeShift AIWB, use breathable backers and adjustable ride height to balance comfort with concealability.
The hybrid design distributes pressure across the beltline, making the Glock 21 practical for daily concealed carry when paired with a supportive belt.
Glock 21 OWB Holsters for Range and Duty Use
For open carry or training, Glock 21 OWB holsters provide fast access and reliable retention. Paddle and belt-slide options secure the pistol without sacrificing comfort, while the RAPID FORCE® duty holster adds Level 2 or Level 3 retention for law enforcement or field defense. These holsters stabilize the Glock 21 during movement, making them equally effective on the range or in uniform.
Light-Bearing and MOS-Ready Glock 21 Holsters
Many shooters equip their Glock 21 with lights or optics, and Alien Gear supports those setups with precision-molded shells. Whether you run a Streamlight TLR-7A, SureFire X300, or Nightstick TCM-550XL, our Glock 21 holster with light maintains secure retention and consistent draw. MOS-ready holsters provide clearance for red dots and suppressor-height sights, ensuring a smooth presentation without snag points.
Glock 21 Gen 3, Gen 4, Gen 5, and SF Support
Every Glock 21 generation carries slightly different dimensions, and Alien Gear holsters are molded for exact fit. Glock 21 Gen 4 holsters balance the dual recoil spring’s bulk with precise shell retention. Glock 21 Gen 5 holsters account for the refined slide and MOS configurations. The Glock 21SF, with its shorter grip profile, receives its own dedicated mold for improved ergonomics and concealment. This model-specific approach eliminates the sloppy fit found in universal holsters.
Appendix Carry and Minimalist Options
For those who prefer speed and reduced footprint, Alien Gear offers Glock 21 appendix holsters with secure retention and quick draw access. These rigs are compact, yet strong enough to stabilize the pistol’s full-length slide. Adjustable cant and retention let shooters fine-tune comfort while maintaining deep concealment.
Chest Rigs, Drop-Leg, and Modular Carry Platforms
Beyond waistband carry, the ShapeShift Modular Holster System allows the Glock 21 to move seamlessly between IWB, OWB, appendix, chest, and drop-leg platforms. A single custom-fit shell locks into multiple carry styles, giving shooters consistency across training, fieldwork, and tactical environments.
Chest holsters keep the pistol clear of pack straps during backcountry hunts, while thigh rigs provide quick access in vehicle or duty setups.
Built for Durability and Daily Confidence
Alien Gear Glock 21 holsters use high-strength polymer shells and sweat-resistant materials designed for long wear. Adjustable retention ensures a confident drawstroke every time, while breathable backers prevent hot-spot discomfort during extended use.
Unlike universal fits, each holster is engineered for Glock 21 reliability, ensuring your .45 ACP carries as securely as it shoots.
